Various Correlations in Anisotropic Heisenberg XYZ Model with Dzyaloshinski-Moriya Interaction

TL;DR

This paper investigates how the Dzyaloshinski-Moriya interaction influences thermal and decoherence-affected quantum correlations in a two-qubit anisotropic Heisenberg XYZ model, revealing tunable effects on entanglement and discord.

Contribution

It provides a detailed analysis of the role of Dzyaloshinski-Moriya interaction in controlling quantum correlations under thermal and decoherence conditions, highlighting potential for maintaining high correlations.

Findings

Dzyaloshinski-Moriya interaction can enhance correlations in thermal equilibrium.

Intrinsic decoherence causes collapse and revival of entanglement and discord.

Proper parameter tuning sustains high correlation levels despite decoherence.

Abstract

Various thermal correlations as well as the effect of intrinsic decoherence on the correlations are studied in a two-qubit Heisenberg XYZ spin chain with the Dzyaloshinski--Moriya (DM) interaction along the z direction, i.e. Dz. It is found that tunable parameter Dz may play a constructive role on the concurrence (C), classical correlation (CC) and quantum discord (QD) in thermal equilibrium while it plays a destructive role on the correlations in the intrinsic decoherence case. The entanglement and quantum discord exhibit collapse and revival under the phase decoherence. With a proper combination of the system parameters, the correlations can effectively be kept at high steady state values despite the intrinsic decoherence.